I'm a devotee to more hefty racquets, but I tried one of these some years back and thought that Wilson really got it right. They made it not too head-light for its moderate weight so that there was still enough stability in the head, but the "flex profile" in this racquet was rather unique.
The design has most of its flex in the throat, while the hoop is rather firm. That gives it rather crisp feel along with the more tempered response and control of a softer frame. A great combo in my opinion (though opinions vary).
The only other frames I can think of in recent history with a similar flex profile are the Yonex RQiS 1 Tour (Ana switched to that one for a stretch after leaving Wilson) and some of the racquets from Fischer which has become Pacific. Back in the Fischer days a few years ago, their M-Speed Pro #1 98 was one of the best received frames at TW and I used them for a little while myself. Pretty sure that the current Pacific version of that frame is their X Force Pro.
Those nBlade 98's have become rather rare and I'm still sort of surprised that Wilson didn't produce them for a little longer than they did. There's been more than one user who has asked for help around here with finding a current alternative. Hopefully you have a good go with it - I'd bet that given the measure of flex in that racquet, it might be a little dead if you string it too tightly, especially with one of the poly options. The one I tried was set up with a snug bed of multifiber and it was still a little on the mellow side.